Carburetor



Aug. 24 1926.

. R. M. ANDERSON CARBURETOR Filed Dec. 2:5, 1922 RAYMOND M. ANDERSON I N VEN TOR.

, ATTORNEY.

Patented Aug. 24, 1926.

UNITED STATES RAYMOND M. ANDERSON, 0]?

PATENT OFFICE.

OARBURETOR.

Application filed December 23, 1922. Serial No. 608,706.

This invention relates to thermostats adapted to be used with carburetors for internal combustion engines.

The difficulty heretofore experienced with thermostats when applied to carburetors has been that they took to long to operate when they responded to engine (e. g. jacket) temperature so that they delivered an excessively rich mixture while the engine was warming up, and when the need for the excessively rich mixture no longer existed as the center of the piston heats up more quickly than any part of the engine except the exhaust valve and the temperature of the piston is a determining factor in mixture proportion.

The figure shows a cross sectional view of the thermostat applied to a carburetor.

In the figure C is the air entrance, D is the Venturi tube into which discharges the fuel nozzle E which obtains its fuel from the constant level reservoir F through an orifice 2 which is controlled by a needle valve 1 having a tapered point 12. The upper portion of this needle valve 1 is threaded and provided with a screw-driver slot 13. This needle is threaded into a bushing 3 which is supported by the thermostat 9. The thermostat 9 is slotted and engages with a slot 4 in the bushing 3. The other leg of the -U-shaped, thermostat 9 engages with a slot 8 in a piece 7, which is threaded into the casting 10 of the carburetor.v The piece 7 is provided with a cylindrical passage 6 in which slides the bushing 3. A recess 5 is provided in the bushing 3 and the pin 11 is placed in the piece 7 so as to limit the upward and downward movement of the bushing 3. This structural detail of the thermostatic control is covered by my copending application, Serial No. 577,507, filed July 26, 1922. A housing G isprovided-en: closing, the thermostat 9. A pipe H connects this housing with the outside of the exhaust pipe J. A passage A connects the inside of the housing G with the outlet side of the Venturi tube D. A bypass B also connects the housing G with the mixture outlet L in advance of the throttle valve K. An auxiliary air vented reservoir M is interposed between the nozzle E and the fuel outlet 2. The air vent N draws its air from the interior of the housing G. The bypass 0 leads to the outlet P adjacent to and in advance of the throttle K. An opening Q- admits diluting air into this bypass and this opening Q also obtains its air from the interior of the housing G.

Operatz'0n.-By reason of the existence of the passages A and B connecting the chamber G with the mixing chamber and mixture outlet respectively, the vent N communicating to the chamber M, orificeQ to the bypass 0, and the pipe H connecting the chamber G with the outside of the exhaust pipe it follows that whether the throttle is open or shut and whether the engine is running fast or slow. provided the engine is operating, there will be a flow of air at all times down H and into G and this air will be heated by contact with the exhaust pipe J. It therefore follows that the thermostat 9 will be raised in temperature at a greater rate than the temperature of the engine by reason of the superheated air admitted from the exhaust pipe.

What I claim is A carburetor having a cold air entrance, a mixing chamber, and a mixture outlet, a throttle valve therein, thermostatic means for controlling the mixture ratio, a housing enclosing said thermostatic means, asource of heated air, a passage connecting said housing means to the mixture outlet above the throttle valve therein, another pipe connecting said housing to the source of heated a1r.

In testimony whereof I aflix my signature.

RAHIOND M. ANDERSON. 

